They removed elementalist auras because they were "too distracting" but those auras were nothing compared to what we have now. With the exception of combo fields, there's no reason why any player needs to actually see the weapon/skill effects of another player if they don't want to. It's actually hard to impossible to see combo fields now because there's so many effects going on over them which results in them being far less engaging.
Boss tells are also impossible to see when you literally cannot see their model. Also model culling does not prioritize bosses so even if you turn model culling on to the highest setting for performance reasons, there's no small chance that the boss' model will be invisible anyway. (And then there's the Madusa's gaze ability where the eye is literally too high to see on some models so you have no idea when you should look away to avoid being frozen...)
"We don't want you to play the interface" falls rather flat when, if you're melee, the only way to see that you're in melee range and hitting a boss is to look at your auto-attack skill and see if the boss is in range or not because there are so many weapon and skill effects going off on top of the large, particle effect laden skins that you cannot see what your character is doing. Honestly, at this point I tend to just range auto-attack on bosses because I can't see anything going on in melee range and there's too many mechanics that insta-down you where it's impossible to see when to dodge. My DPS is less than it would be otherwise but my QoL skyrockets when I can actually see the occasional tell or avoid a poison/fire field instead of dying to it and having to run back from a waypoint all because there was no way to see it through all the frivolous effects.